The Fishman Matrix Infinity is an undersaddle acoustic guitar pickup and preamp system that delivers transparent and natural sound allowing your instrument"s natural tone to be heard in amplified performances. This Fishman pickup system is noted for providing crystal clear string response, balance, and sensitivity. The pickup senses the motion of the entire saddle, providing superb string-to-string balance and great sensitivity to the guitar strings and guitar top. The Fishman Matrix Infinity features switchable voicing and full volume and tone control with minimal tone coloration.Completely redesigned active, endpin mounted preamp Soundhole mounted rotary controls for Volume & Tone Unique Tone control cuts mids while boosting treble and bass Integrated LED low battery indicator Switchable voicing to accommodate all guitar body sizes & performance situations Available in two saddle slot widths: wide 1/8" (3.2mm) format or narrow 3/32" (2.3mm) format Standard overall length of 2.65"(67.3mm) will fit most guitars with string spacings of up to 2.5" (63.5mm) Solderless connections Professional installation is recommended Requires 9V battery (not included)